Response of the amphibian tadpole  Xenopus laevis  to atrazine during sexual differentiation of the ovary | Zendy

TaveraMendoza Luz | Zendy; Ruby Sylvia | Zendy; Brousseau Pauline | Zendy; Fournier Michel | Zendy; Cyr Daniel | Zendy; Marcogliese David | Zendy

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Response of the amphibian tadpole Xenopus laevis to atrazine during sexual differentiation of the ovary

Author(s) -

TaveraMendoza Luz,

Ruby Sylvia,

Brousseau Pauline,

Fournier Michel,

Cyr Daniel,

Marcogliese David

Publication year - 2002

Publication title -

environmental toxicology and chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.1

H-Index - 171

eISSN - 1552-8618

pISSN - 0730-7268

DOI - 10.1002/etc.5620210621

Subject(s) - xenopus , biology , gonad , ovary , amphibian , atrazine , medicine , atresia , african clawed frog , endocrinology , sexual differentiation , tadpole (physics) , salientia , andrology , metamorphosis , anatomy , pesticide , larva , ecology , genetics , particle physics , gene , physics

Xenopus laevis tadpoles (stage 56) were exposed to 21 μg/L atrazine under laboratory‐controlled conditions in a static system. Following a 48‐h exposure period at 21 ± 0.5°C during sexual differentiation, tadpoles were fixed, and the kidney‐gonad complex was microdissected. Quantitative histological analysis revealed in a trazine‐exposed ovaries a significant ( p < 0.05) increase in frequency of secondary oogonia. Atresia, or oogonial resorption of both primary and secondary oogonia, also increased significantly ( p < 0.05). The results suggest that these primary germ cells, which constitute the total number of germ cells in the ovary for the reproductive life of the organism, were reduced by 20% following a 48‐h exposure period compared to 2% in controls.

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